Rectangular from the top, with blunted corners, the distinguishing two fat lozenze tan buttons seem retro even for 1988. They fit fingers nicely. With a high back and taper to the cord, the mouse almost emulates a little sports car. Its top label says MSC OMNIMOUSE.
The shape of the housing for the 1" diameter rubberized ball seems somehow reminiscent of an old arched jukebox. (It looks identical to the ball retainer on a Commodore mouse.) The ball rides at the rear of the mouse. A round glider sits at each of the 4 corners. The mouse attaches to the computer with a serial DE-9 hole plug. The little screws require a screwdriver rather than fingers to operate them.
A 5-1/2" floppy provides a V5. 52H 301989 OMNIMOUSE Opto-Mechanical Mouse driver © MSC 1988.
The little accordion-fold user's manual declares the mouse 100% Microsoft mouse-compatible, and, "The ability to use CAD, Business Graphics, Desktop Publishing, Word Processing, and Paint programs is literally in your hands." Nonetheless, installation seems to require some command line settings. Four drawings accompany written instructions for cleaning the rubber ball.
Bottom mouse label:
MSC Technologies, Inc. OMNIMOUSE NEO-CN1 0780 FCC ID: CWE5TDMM1 Made in Japan
MSC User's Manual OMNIMOUSE Opto-Mechanical Mouse and 5 1/2" flopp driver V5.52H (C) MSC 1988